The Key /

Photochromic molecules have, under normal conditions, a folded shape that makes them transparent. When absorbing ultraviolet light, their shape changes, the molecular structure opens and absorbs visible light. The two forms of the photochromic molecule - open and closed - exist in balance with a bond that’s continuously broken and rebuilt.

The photochromic molecule constantly switches between its transparent and dark states. If the lens is exposed to significant levels of UV light, most of the molecules will be in the open state, darkening the lenses. In the absence of UV light, the molecules will remain closed, resulting in clear lenses.

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NEOCHROMES, STATE-OF-THE-ART TECHNOLOGY LENSES FEEL NATURAL AND BECOME SECOND NATURE TO THE USER.

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Before UV light exposure, the lens is in its most transparent state.

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When the lens is first exposed to UV light, the photochromic molecules begin to change from clear to dark.

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Lenses are at peak activation. Light transmission, activated color, and color uniformity can be assessed at this state.

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Fast fade-back is critical. It begins when UV light does not fall on the lens any longer. The shorter the fade-back, the more comfortable and functional the lens is to the wearer.

Neochromes /
Behavior

TEMPERATURE AND ITS EFFECT ON PHOTOCHROMIC TECHNOLOGY

Any photochromic lens is affected by temperature. In cold temperatures, photochromic lenses darken more and take longer to fade back. In warmer temperatures, the lenses don't darken as much and fade back more quickly. This is a characteristic of the state of balance in a photochromic system.

In Neochromes lenses, special attention is paid to performance at high temperatures. At night temperatures (33ºC / 91ºF), they will reach functional darkness that is similar to many polarized lenses. At this temperature, the fade-back time is around 32 seconds.

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